\begin{tikzpicture}[>=latex,every node/.style={anchor=south west,,inner sep=0,fill=white}]

        %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        \node[] at (0,0)(token){
            \begin{tabular}{|C{4em}|C{12em}|}
                \hline
                \color{red}正规式 & 正规式的\color{red}值\\ \hline
                ab.cde & abcde \\ \hline
                ab|cde & ab, cde \\ \hline
                $\rm{a^{+}}$ & $\rm{{a},{aa}, { aaa }, \ldots, {a}^{n}, \ldots}$ \\ \hline
                $\rm{a^{*}}$ & $\rm{\varepsilon, {a}, {aa}, {a a} {a}, \ldots, {a}^{n}, \ldots}$ \\ \hline             
            \end{tabular}
       };
    \end{tikzpicture}